/*
 * Symphony - A modern community (forum/SNS/blog) platform written in Java.
 * Copyright (C) 2012-2018,  b3log.org & hacpai.com
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.b3log.symphony.event;

import org.b3log.latke.Latkes;
import org.b3log.latke.event.AbstractEventListener;
import org.b3log.latke.event.Event;
import org.b3log.latke.event.EventException;
import org.b3log.latke.ioc.inject.Named;
import org.b3log.latke.ioc.inject.Singleton;
import org.b3log.latke.logging.Level;
import org.b3log.latke.logging.Logger;
import org.b3log.latke.servlet.HTTPRequestMethod;
import org.b3log.latke.urlfetch.HTTPRequest;
import org.b3log.latke.urlfetch.HTTPResponse;
import org.b3log.latke.urlfetch.URLFetchService;
import org.b3log.latke.urlfetch.URLFetchServiceFactory;
import org.b3log.symphony.model.Article;
import org.b3log.symphony.util.Symphonys;
import org.json.JSONObject;

import javax.servlet.http.HttpServletResponse;
import java.net.URL;
import java.net.URLEncoder;

/**
 * Sends an article to QQ qun via
 * <a href="https://github.com/b3log/xiaov">XiaoV</a>.
 *
 * @author <a href="http://88250.b3log.org">Liang Ding</a>
 * @version 1.4.0.2, May 29, 2016
 * @since 1.4.0
 */
@Named
@Singleton
public class ArticleQQSender extends AbstractEventListener<JSONObject> {
	// 添加文章,此字段是从EventTypes移动至此
	public static String ADD_ARTICLE = "Add Article";

	/**
	 * Logger.
	 */
	private static final Logger LOGGER = Logger.getLogger(ArticleQQSender.class);

	/**
	 * URL fetch service.
	 */
	private static final URLFetchService URL_FETCH_SVC = URLFetchServiceFactory.getURLFetchService();

	@Override
	public void action(final Event<JSONObject> event) throws EventException {
		final JSONObject data = event.getData();
		LOGGER.log(Level.TRACE, "Processing an event [type={0}, data={1}]", event.getType(), data);

		if (!Symphonys.getBoolean("xiaov.enabled")) {
			return;
		}

		try {
			final JSONObject article = data.getJSONObject(Article.ARTICLE);
			final int articleType = article.optInt(Article.ARTICLE_TYPE);
			if (Article.ARTICLE_TYPE_C_DISCUSSION == articleType || Article.ARTICLE_TYPE_C_THOUGHT == articleType) {
				return;
			}

			final String title = article.optString(Article.ARTICLE_TITLE);
			final String permalink = article.optString(Article.ARTICLE_PERMALINK);
			final String msg = title + " " + Latkes.getServePath() + permalink;
			sendToXiaoV(msg);

		} catch (final Exception e) {
			LOGGER.log(Level.ERROR, "Sends the article to QQ group error", e);
		}
	}

	private void sendToXiaoV(final String msg) {
		final String xiaovAPI = Symphonys.get("xiaov.api");
		final String xiaovKey = Symphonys.get("xiaov.key");

		final HTTPRequest request = new HTTPRequest();
		request.setRequestMethod(HTTPRequestMethod.POST);

		try {
			request.setURL(new URL(xiaovAPI + "/qq"));

			final String body = "key=" + URLEncoder.encode(xiaovKey, "UTF-8") + "&msg="
					+ URLEncoder.encode(msg, "UTF-8") + "&user=" + URLEncoder.encode("sym", "UTF-8");
			request.setPayload(body.getBytes("UTF-8"));

			final HTTPResponse response = URL_FETCH_SVC.fetch(request);
			final int sc = response.getResponseCode();
			if (HttpServletResponse.SC_OK != sc) {
				LOGGER.warn("Sends message to XiaoV status code is [" + sc + "]");
			}
		} catch (final Exception e) {
			LOGGER.log(Level.ERROR, "Sends message to XiaoV failed: " + e.getMessage());
		}
	}

	/**
	 * Gets the event type {@linkplain EventTypes#ADD_ARTICLE}.
	 *
	 * @return event type
	 */
	@Override
	public String getEventType() {
		return ADD_ARTICLE;
	}
}
